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Noise of an imaging front-end

Discussion in 'Electronic Design' started by ChrisNeumi, Mar 22, 2005.

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  1. ChrisNeumi

    ChrisNeumi Guest

    I'm designing an imaging front-end with a CCD Detector. Now I want to
    predict, what my system SNR will be. From the optics and the detector
    everything is quite clear and in my model.

    How can I model the electronic readout circuit of the CCD, particularly
    the AD-converter?

    Does anyone have experience?
  2. Tim Wescott

    Tim Wescott Guest

    How accurate a model do you want?

    As a first cut you can just model the ADC as a pass-through.

    Then add in uniformly distributed noise one LSB wide, to simulate

    Then note that a fast ADC like that has more "conventional" noise in
    it's front end than quantization noise, so add that in as well (consult
    the data sheets).

    Then note that a fast ADC like that suffers from charge injection when
    it converts, so add in that effect (consult data sheets, app notes, app

    If you are buffering the signal note that your buffer amplifier
    generates noise -- add that in.

    Oh -- your ADC has differential and integral nonlinearity -- do you
    care? If yes, add it in.

    Sampling? Add it in.

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